What question did this study set out to answer?

The research aims to develop a quinoidal metal-organic framework for better energy storage solutions in micro-supercapacitors and lithium batteries.

February 27, 2026

A Quinoidal Two-Dimensional Metal-Organic Framework for High-Performance Micro-Supercapacitors and Solid-State Lithium Batteries.

Puntos clave

The research aims to develop a quinoidal metal-organic framework for better energy storage solutions in micro-supercapacitors and lithium batteries.
Synthesis of a quinoidal dicarboxylate ligand and integration into metal-organic frameworks.
Characterization of Cu-based MOFs with layers and redox-active characteristics.
Testing exfoliated nanosheets in graphene films for capacitance and energy density measurements.
Incorporation of nanosheets as ionic fillers in solid polymer electrolytes for lithium battery performance.
Cu-based metal-organic framework shows significant pseudocapacitance improvement with narrow bandgap.
Exfoliated nanosheets achieve high areal capacitance of 29.6 mF cm-2 and volumetric capacitance of 18.1 F cm-3.
Energy density of 2.6 mWh cm-3 at 160 mW cm-3 indicates strong performance.
Lithium battery demonstrates 169.8 mAh g-1 at 0.2 C with 93% capacity retention after 400 cycles.

Resumen

Two-dimensional (2D) metal-organic frameworks (MOFs) integrating redox-active linkers enable dense charge sites and open ion pathways for microscale energy storage. We report a quinoidal dicarboxylate ligand, AQM-H2L, derived from p-azaquinodimethane, forming crystalline frameworks with Cu2+ and Zn2+ nodes. The Cu-based MOF (AQM-AQM-H2L-Cu) exhibits layered sheets (>14 Å spacing) constructed from dinuclear Cu-carboxylate units and conjugated AQM linkers, which narrow the bandgap and introduce Cu2+/Cu+ pseudocapacitance. Exfoliated nanosheets (∼5 nm) retain crystallinity and excellent processability. Integrated into graphene films, they deliver areal and volumetric capacitances of 29.6 mF cm-2 and 18.1 F cm-3, achieving 2.6 mWh cm-3 energy density at 160 mW cm-3. As ionic fillers (1 wt%) in PEO solid polymer electrolytes, the nanosheets markedly enhance LiFePO4 cell performance, affording 169.8 mAh g-1 at 0.2 C and 93% retention after 400 cycles. This work establishes quinoidal linkers as a compact and robust design motif for ionically active 2D frameworks toward high-performance miniature and solid-state energy devices.

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